South Sudan, he claims is too weak to secure Abyei from Khartoum without outside assistance.
The two sides fought in the oil-rich border region of Abyei earlier this year.
However, they failed at that meeting to reach a deal on the status of Abyei.
But disputes over who was eligible to vote prevented the referendum from going forward in Abyei.
In the meantime Abyei is overseen by 4, 000-plus Ethiopian peacekeepers, paid for by the UN.
The fate of the Abyei region and other disputed border areas are also a point of contention.
The UN has boosted controls in Abyei, where an estimated 30 people have died in fighting since Friday.
According to South Sudanese military spokesmen, militiamen captured in Abyei said they were ordered to attack by Khartoum.
The story of Abyei is stark proof that the underlying causes of north-south conflict in Sudan have not changed.
Limiting peacekeepers to the south could complicate efforts to monitor the boundary, parts of which, including Abyei, are contested.
The charred remains of John's former home are virtually opposite the front entrance to the UN military base in Abyei.
The mood is particularly tense in Abyei, an area the south thinks it can win over in elections due in 2009.
International mediators long assumed that Abyei would eventually go to the south.
If there is war after independence, Abyei will likely be its cause.
However, the two leaders still need to agree on who owns the flashpoint Abyei province and other regions along their disputed 2, 000km (1, 200 mile) border.
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In September, the two countries' leaders signed a deal to resume oil exports, but failed to address other issues such as the fate of Abyei.
Most importantly, the disposition of the town of Abyei remains undetermined.
The status of Abyei does not threaten southern independence per se.
Abyei's residents were supposed to vote on a referendum to determine the disposition of their town at the same time as the rest of the south.
Returning to Juba from a visit to Abyei, the SPLM's Secretary General Pagan Amum said the situation in the border region was now calm, although still tense.
Forced to flee Abyei, they now live in a sprawl of hastily erected huts about 40km south, at Agok, where they survive largely on help from foreign aid-workers.
The agreement called for the creation of temporary administrative and security arrangements for the Abyei region, including the creation of a police service and a limited governing council.
But Abyei is tougher, because oil was recently discovered there.
If war broke out, it would probably be fought in the disputed oil fields in the borderlands between north and south: in southern Kordofan, Abyei, Unity and the Upper Nile states (see map).
The agreement did not address the status of disputed areas along the border and the fate of Abyei, critical security issues that must be resolved if the two countries are to have lasting peace.
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